Non-nullable property 'ProviderId' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Nullability of reference types in type of parameter 'state' of 'lambda expression' doesn't match the target delegate 'Func<object?, Task>' (possibly because of nullability attributes).

The using directive for 'System.Text' appeared previously in this namespace

Cannot convert null literal to non-nullable reference type.

Non-nullable field '_TcpClient' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field 'inputStream' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field 'outputStream' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field '_ReceiveMassagesTask' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable event 'NewMessage' must contain a non-null value when exiting constructor. Consider declaring the event as nullable.